Texas Instruments SNJ54LVTH574FK

Overview

SNJ54LVTH574FK from Texas Instruments is a military-grade, 20-pin LCCC-packaged octal D-type flip-flop with positive-edge clocking, 3-state outputs, bus-hold inputs, and Ioff hot-insertion support. It operates from 2.7 V to 3.6 V VCC, supports mixed-mode 5-V input tolerance, and delivers 150 MHz max clock frequency with 2.4 ns data setup time at VCC = 3.3 V - used in radiation-tolerant avionics data latching and high-reliability bus interface circuits.

For engineers reviewing the SNJ54LVTH574FK datasheet, SNJ54LVTH574FK pinout, SNJ54LVTH574FK application, or SNJ54LVTH574FK equivalent, key selection criteria include its −55°C to +125°C operating range, MIL-PRF-38535 qualification, LCCC ceramic package with solderable leads, bus-hold input retention without external resistors, and compatibility with 3.3-V ABT logic families in mixed-voltage backplanes.

Technical Context

This device implements eight independent edge-triggered D-type flip-flops synchronized to the rising edge of CLK, with a shared output-enable (OE) control that places all Q outputs into high-impedance without affecting internal state retention. Its ABT (Advanced BiCMOS Technology) architecture enables TTL-level input compatibility while operating at 3.3-V VCC.

The SNJ54LVTH574FK integrates Ioff circuitry to disable outputs during power-down, preventing backflow current, and features active bus-hold on all eight D inputs - eliminating need for pullup/pulldown resistors and ensuring stable logic levels on floating inputs during system initialization or hot-swap events.

Key Specifications

Pinout & Package

LCCC (Leadless Ceramic Chip Carrier) package, 20-pin, hermetically sealed ceramic body with solderable perimeter leads; 8.89 mm × 8.89 mm footprint, 2.03 mm max height, 1.27 mm lead pitch, designed for high-reliability PCB mounting and thermal stability in harsh environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal D-type flip-flop applications.

Compared with SNJ54LVTH574FK, the SNJ54LVTH16374FK offers double data width but consumes 26× more quiescent current and requires PCB redesign, while the SNJ54ACT574J sacrifices 5-V input tolerance, bus-hold, and hot-insertion support for simpler legacy integration.

Availability

SNJ54LVTH574FK is available at Aetrix Electronics and suitable for avionics data acquisition, military backplane interface, and radiation-tolerant instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SNJ54LVTH574FK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, aerospace, and defense markets.

The SNJ54LVTH574FK belongs to TI's military logic family designed for high-integrity digital interfacing in mission-critical systems - emphasizing radiation tolerance, extended temperature operation, and compliance with MIL-PRF-38535 standards.

FAQ

What is the maximum clock frequency supported by SNJ54LVTH574FK?

The SNJ54LVTH574FK supports a maximum clock frequency of 150 MHz at VCC = 3.3 V ± 0.3 V and TA = 25°C. This rating is guaranteed across its full −55°C to +125°C operating range per MIL-PRF-38535 test conditions. The device achieves this performance using ABT process technology optimized for speed-power tradeoffs in high-reliability applications. SNJ54LVTH574FK maintains timing integrity even under voltage droop down to 2.7 V VCC.

Does SNJ54LVTH574FK support hot insertion, and how is it implemented?

Yes, SNJ54LVTH574FK supports hot insertion via two integrated features: Ioff circuitry disables outputs when VCC = 0 V to prevent backflow current, and power-up 3-state ensures outputs remain in high-impedance during power ramp-up. These functions are inherent to the ABT design and require no external components. SNJ54LVTH574FK is explicitly characterized for hot-swap use in backplane and modular avionics systems per datasheet Section 1.

What package type and lead finish does SNJ54LVTH574FK use?

SNJ54LVTH574FK uses a 20-pin LCCC (Leadless Ceramic Chip Carrier) package with tin-lead (SnPb) solderable leads, non-RoHS compliant. The package measures 8.89 mm × 8.89 mm with 1.27 mm lead pitch and 2.03 mm max height. It is hermetically sealed for moisture resistance and rated for −65°C to +150°C storage. SNJ54LVTH574FK is supplied in tubes of 55 units per MIL-STD-883 packaging requirements.

How does the bus-hold feature work on SNJ54LVTH574FK data inputs?

The bus-hold circuitry on SNJ54LVTH574FK's D inputs actively maintains the last-valid logic state (high or low) when inputs float, drawing ±75 μA at VCC = 3 V. This eliminates need for external pullup/pulldown resistors and prevents metastability during FPGA configuration or bus contention. Bus-hold is enabled by default and cannot be disabled; SNJ54LVTH574FK datasheet specifies it operates across full temperature and voltage range.

Is SNJ54LVTH574FK compatible with 5-V logic systems?

Yes, SNJ54LVTH574FK accepts input voltages up to 5.5 V on all D and OE inputs while operating from a 3.3-V VCC supply - enabling direct interfacing with 5-V TTL outputs without level shifters. Its output high voltage (VOH) reaches 2.4 V at IOL = 24 mA, ensuring noise margin when driving other 3.3-V ABT devices. SNJ54LVTH574FK maintains this mixed-mode capability across its full military temperature range.